fix for hanging threads and leave message handling
instruction for OSX
added string register method
Merge branch 'master' of https://github.com/sphaero/pyZOCP
fixed default data for a node to emtpy dict instead of empty string
refactored urwid monitor to a class
added widget remove on exit
removed obsolete code
typo
Merge pull request #4 from sphaero/master

Fixes for OSX and refactor of Urwid code